Probably because countries like the Peoples Republic Of China's armed forces total about 2.3 million and that's just the Liberation army not including the Navy and Air Force and that's just on Planet Earth.

See, normal people would realize they'd made a mistake, and offer an alternative explanation...or they'd just ignore it.

Karen Travis vehemently got into arguments about how it made sense for an army of 3 million soldiers/spacers could fight an inter galactic war.